73644973 has 2 divisors, whose sum is σ = 73644974. Its totient is φ = 73644972.

The previous prime is 73644971. The next prime is 73644983. The reversal of 73644973 is 37944637.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70610409 + 3034564 = 8403^2 + 1742^2 .

It is a cyclic number.

It is not a de Polignac number, because 73644973 - 2¹ = 73644971 is a prime.

Together with 73644971, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73644971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36822486 + 36822487.

It is an arithmetic number, because the mean of its divisors is an integer number (36822487).

Almost surely, 2^73644973 is an apocalyptic number.

It is an amenable number.

73644973 is a deficient number, since it is larger than the sum of its proper divisors (1).

73644973 is an equidigital number, since it uses as much as digits as its factorization.

73644973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 381024, while the sum is 43.

The square root of 73644973 is about 8581.6649317018. The cubic root of 73644973 is about 419.1611621174.

The spelling of 73644973 in words is "seventy-three million, six hundred forty-four thousand, nine hundred seventy-three".